Quarterly report pursuant to Section 13 or 15(d)

Note 8 - Derivatives and Fair Value - Gain Loss on Derivative Instruments (Details)

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Note 8 - Derivatives and Fair Value - Gain Loss on Derivative Instruments (Details) - Crude Oil Swaps [Member] - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Derivative instruments loss, net $ (2,320) $ 3,778 $ (2,268) $ (37,522)
Cash Settlements Paid on Matured Derivative Contracts, Net [Member]        
Derivative instruments loss, net 1 (9,124) (62) (42,683)
Unrealized Gain (Loss) [Member]        
Derivative instruments loss, net $ (2,321) $ 12,902 $ (2,206) $ 5,161